New cyclic and macrocyclic silaolefins via ring-closing metathesis of 1,1-bis(silyl)ethene-tethered dienes
摘要:
Dialkenyl-substituted 1,1-bis(silyl)ethenes of the general formulae (CH2=CH(CH2)(n)Me2Si)(2)C=CH2 and (CH2=CH(CH2)(n)OMe2Si)(2)C=CH2, (where n = 1-3) have been successfully converted into new silacyclic or silamacrocyclic compounds in the presence of ruthenium-benzylidene complex (first generation Grubbs catalyst). The structures of both macrocyclic silaolefins have been confirmed using X-ray diffraction. (c) 2007 Elsevier B.V. All rights reserved.